My mercs are in Estoni just outside Jake's House and interrupting, shooting enemies that come into the fenced-in junkyard. The problem is that enemies outside the fence are shooting my mercs through the fence almost every round. The enemies are even shooting them through the walls of Jake's house when my mercs hide inside with the door closed! (My mercs can't see the enemies outside the fencing that are shooting them almost every round.) The enemies are even shooting my mercs through 2-3 walls--the outside wall to Jake's house and the inside bathroom wall! It's amazing!

7609 w/ja2_7609en+AI_r513.exe

Well, it there are enemies that shooting you, there is probably one or more enemies that's seeing one of your merc, maybe through the house windows, and other enemies even if don't see you may use suppression fire
but i doubt a bullet can go through 2-3 walls but yes bullets sometime can go through walls or doors.